豫东平原区的地球物理特征及找煤远景
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摘要
豫东平原区勘探手段多样,地质资料丰富。通过对豫东平原区重力场、磁力场、地震反射波等地球物理特征综合分析,并进行联合反演及钻探资料对比。区域地质研究和综合地质解释的成果表明,该区构造型式多样,挤压式、伸展式、走滑式均有表现,但以伸展式断裂为主;构造线可见三组发育方向,近EW向构造形成最早,NNE-NE向构造形成最晚,而NW向构造则介于二者之间,且具有左行平移走滑性质;该区总体格局为“两坳夹一隆”,即开封坳陷、周口坳陷、通许隆起,其煤炭资源丰富,埋藏深度变化较大;隆、坳中发育很多结构不同的次级凸起和凹陷,正确认识这些隆、坳中的次级构造单元及结构,是预测找矿的关键。
It is an advance in modern geology to study an area by many kinds of prospecting methods. Based on the comprehensive analysis of all kinds of geophysical data, the characteristics of geophysical fields are expounded about east Henan plain, including gravity field, magnetic field and seismic reflective waves, et al. By united inverse gravity, magnetic and seismic explanation combined with drilling data, it is carried out that the regional geological research and comprehensive geological explanation, and the coal-looking hopeful target is pointed out last. The results illustrate that the structural forms of east Henan plain are such manifold as compression, stretching and strike slip, but mostly stretching fault. The tectonic lines reveal three directions as near-EW early, NNE-NE late and NW between them; Furthermore, the NW faults have the property of left-lateral sense strike-slip. The general structural framework of east Henan plain is one uplift between two depressions, i.e. Kaifeng depression, Zhoukou depression and Tongxu uplift. In which with plenty of coal resources but with a large change of buried depths. The uplift and two depressions develop many second-order upheavals and downwarpings of different textures. It is the key to look and forecast resources that the secondary structural units and their textures are recognized correctly.
It is an advance in modern geology to study an area by many kinds of prospecting methods. Based on the comprehensive analysis of all kinds of geophysical data, the characteristics of geophysical fields are expounded about east Henan plain, including gravity field, magnetic field and seismic reflective waves, et al. By united inverse gravity, magnetic and seismic explanation combined with drilling data, it is carried out that the regional geological research and comprehensive geological explanation, and the coal-looking hopeful target is pointed out last. The results illustrate that the structural forms of east Henan plain are such manifold as compression, stretching and strike slip, but mostly stretching fault. The tectonic lines reveal three directions as near-EW early, NNE-NE late and NW between them; Furthermore, the NW faults have the property of left-lateral sense strike-slip. The general structural framework of east Henan plain is one uplift between two depressions, i.e. Kaifeng depression, Zhoukou depression and Tongxu uplift. In which with plenty of coal resources but with a large change of buried depths. The uplift and two depressions develop many second-order upheavals and downwarpings of different textures. It is the key to look and forecast resources that the secondary structural units and their textures are recognized correctly.
引文
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犤2犦河南煤田地质公司.河南省晚古生代聚煤规律犤M犦.武汉:中国地质大学出版社,1991:141-194.
犤3犦河南省地质矿产局.河南省区域地质志犤M犦.北京:地质出版社,1989:627-660.
犤4犦刘光鼎.论综合地球物理解释———原则与实例犤A犦.见:地球物理学报编辑委员会编.八十年代中国地球物理学进展———纪念傅承义教授八十寿辰犤C犦.北京:学术出版社,1989:231-242.
犤5犦刘光鼎,郝天珧.中国的地质环境与隐伏矿床犤J犦.地球物理学报,1998,41(2):182-188.
犤6犦刘光鼎,郝天珧.应用地球物理方法寻找隐伏矿床犤J犦.地球物理学报,1995,38(6):850-854.
犤7犦李宝芳,温显端,李贵东.华北石炭、二叠系高分辨层序地层分析犤J犦.地学前缘,1999,6(增刊).
犤8犦ARBrown.Structuralinterpretationfromhorizontalseismicsec-tions犤J犦.Geophysics,1983,48:176-189.
犤9犦BergOR,WoolvertonDG.SeismicstratigraphyⅡ:Am.Assn.PetroleumGeologistsMem犤J犦.Tulsa,1985,39.
犤10犦杨起.煤地质学进展犤M犦.北京:科学出版社,1987.
犤11犦徐开礼,朱志澄.构造地质学犤M犦.北京:地质出版社,1989.
犤12犦尚冠雄.华北地台晚古生代煤地质学研究犤M犦.太原:山西科学技术出版社,1997.
犤13犦李思田.断陷盆地分析与煤聚集规律犤M犦.北京:地质出版社,1988.
犤14犦中国矿业学院物探教研室.中国煤田地球物理勘探犤M犦.北京:煤炭工业出版社,1981.
犤15犦RobertE.Sheriff.Geophysicalmethods犤M犦.PrenticeHall,EnglewoodCliffs,NewJersey,1989:52-147.
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